Which statement is CORRECT?

Here,
'even' is an even number;
'odd' is an odd number;

{Evens} = 2Z = {..., -6, -4, -2, 0, 2, 4, 6, ...}
{Odds} = 2Z + 1 = {..., -5, -3, -1, 1, 3, 5, ...}.